Here you can create your own customized strategy for opening Elvenar event chests. Assign priority to each chest in the table below. Priority can be any number - the important part is which chest has higher or lower number attached to it. Lower numbers mean higher priority.
This defines your strategy - the next time you have a draw of 3 chests in the event, you will be picking the chest with the highest priority out of the three. And this analysis allows you to figure out what can you expect from your particular customized strategy.
Also take a look at calculating optimal strategies given rewards that you want to target: Optimal Event Chest Strategy